Enable only_retract_when_crossing_perimeters by default

README.markdown

@@ -193,7 +193,7 @@ The author of the Silk icon set is Mark James.
         --avoid-crossing-perimeters Optimize travel moves so that no perimeters are crossed (default: no)
         --only-retract-when-crossing-perimeters
                             Disable retraction when travelling between infill paths inside the same island.
-                            (default: no)
+                            (default: yes)
         --solid-infill-below-area
                             Force solid infill when a region has a smaller area than this threshold
                             (mm^2, default: 70)

lib/Slic3r/Config.pm

@@ -543,7 +543,7 @@ our $Options = {
         tooltip => 'Disables retraction when travelling between infill paths inside the same island.',
         cli     => 'only-retract-when-crossing-perimeters!',
         type    => 'bool',
-        default => 0,
+        default => 1,
     },
     'support_material' => {
         label   => 'Generate support material',